Exhaust stack



FIG. 1 is a perspective view of an exhaust stack according to a first embodiment of the invention;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a first cross-sectional view thereof, taken along line 9-9 in FIG. 3 ; and,

FIG. 10 is a second cross-sectional view thereof, taken along line 10-10 in FIG. 3 .

FIG. 11 is a perspective view of an exhaust stack according to a second embodiment of the invention;

FIG. 12 is a second perspective view thereof;

FIG. 13 is a front view thereof;

FIG. 14 is a rear view thereof;

FIG. 15 is a left view thereof;

FIG. 16 is a right view thereof;

FIG. 17 is a top view thereof;

FIG. 18 is a bottom view thereof;

FIG. 19 is a first cross-sectional view thereof, taken along line 19-19 in FIG. 13 ; and,

FIG. 20 is a second cross-sectional view thereof, taken along line 20-20 in FIG. 13 .

The broken lines in the figures illustrate portions of the exhaust stack that form no part of the claim. 

CLAIM The ornamental design for an exhaust stack, as shown and described. 